Section 9 Preventive Maintenance - York YT Millennium Operating & Maintenance

Preventive Maintenance
Maintenance for the compressor assembly consists of
checking the operation of the oil return system and chang-
ing the dehydrator, checking and changing the oil, check-
ing and changing the oil filters, checking the operation of
the oil heater, checking the operation of the oil pump and
observing the operation of the compressor.
Internal wearing of compressor parts could be a serious
problem caused by improper lubrication, brought about
by restricted oil lines, passages or dirty oil filters. If the
unit is shutting down on (HOT) High Oil Temperature
or Low Oil Pressure (OP), change the oil filter element.
For information covering the OptiView Control Center
operation, refer to "Section 2". The operating points
of the pressure and temperature cut outs are shown in
It is the responsibility of the owner to provide the nec-
essary daily, monthly and yearly maintenance require-
ments of the system. IMPORTANT: If a unit failure
occurs due to improper maintenance during the warranty
period; YORK will not be liable for costs incurred to
return the system to satisfactory operation.
In any operating system it is most important to provide
a planned maintenance and inspection of its functioning
parts to keep it operating at its peak efficiency. Therefore,
the following maintenance should be performed when
prescribed.
COMPRESSOR
Oil Filter
Oil Filter: On all new chiller start-ups, the
oil filter must be changed after the first 200
hours of operation and again at 500 hours
of operation to insure proper lubrication
quality for the compressor. These filters
should be inspected for excessive debris,
and if found containing excessive debris,
report this to the local YORK Engineered
152
COMPRESSOR
Examine the oil filter element for the presence of alu-
minum particles. Aluminum gas seal rings can contact
the impeller and account for some aluminum particles
to accumulate in the oil filter, especially during the
initial start up and first several months of operation.
However, if aluminum particles continue to accumu-
late and the same conditions continue to stop the unit
operation after a new filter element is installed, notify
the nearest YORK office to request the presence of a
YORK Service Technician.
ELECTRICAL CONTROLS
the Wiring Diagrams. These diagrams also contain a
starting and stopping sequence and timing sequence
diagram.
SECTION 9
PREVENTIVE MAINTENANCE
COMPRESSOR MOTOR
1. Check motor mounting screws frequently to insure
2. Meg motor windings annually to check for dete-
PRESSURE TESTING
The chiller should be pressure tested annually. Any leaks
found must be repaired immediately. If frequent purging
has occurred, the unit must be pressure tested as soon
as possible to prevent air and moisture from entering
the until. Air and moisture are the worst enemies of
the R-123 system and experience has shown that units
which are maintained tight, are systems that will provide
trouble free efficient operation.
Systems's Service office for evaluation.
After the 500 hour replacement, the oil
filter should be replaced semi-annually, or
when the operating oil pressure drops 30%
from the oil pressure measured at the time
of the previous replacement.
tightness.
rioration of windings.
FORM 160.55-O1 (920)
YORK INTERNATIONAL